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Claude Fable 5.1 is Anthropic's most capable widely released Claude model, useful for hard reasoning, long coding tasks and long documents. Start chatting with Claude Fable 5.1 chatbot on AIFreeForever for free with no login, no sign up. Start a chat by typing in the chatbot box at the top. Enter your prompt, press Enter, and get AI answers from Claude Fable 5.1. For better results from this AI model, it is better to provide detailed instructions and context that lets the model understand the task it is meant to perform.
Anthropic built Claude Fable 5.1 for the hardest work, where a careful answer matters more than a quick one. It has a 1M token context window, reads images, and can write answers of up to 128K tokens. Where it fits best:
Yes, you can use Claude Fable 5.1 for free on AIFreeForever. Alternatively, you may create an account on Claude, Anthropic's own app. If you are a developer, you may obtain an Anthropic API key that allows you to integrate Claude Fable 5.1 into your own chatbot. For the Claude Fable 5.1 chatbot provided on AIFreeForever, your message goes through our server to Claude Fable 5.1 AI provided by Anthropic and you get answers via our chatbot.
Learn more about Claude on Anthropic's website
Anthropic API bills Claude Fable 5.1 per million tokens and it costs two and a half times the price of Claude Opus 5.5. You can also use Claude models in Anthropic's own Claude app, which needs an account. On AIFreeForever, Claude Fable 5.1 is free and you do not require an account to run this model on our website. The table below summarises the price differences between Anthropic's Claude Fable 5.1 and the one provided by AIFreeForever's Free AI.
| Claude Fable 5.1 API | Claude Opus 5.5 API | Claude Sonnet 5.5 API | AIFreeForever's Free AI Claude Fable 5.1 | |
|---|---|---|---|---|
| Input | $10.00 / 1M | $4.00 / 1M | $2.00 / 1M | Free |
| Output | $50.00 / 1M | $20.00 / 1M | $10.00 / 1M | Free |
| Login | Required, plus a key | Required, plus a key | Required, plus a key | None |
| Context | 1M | 1M | 1M | 1M |
| Limit | Rate limited by tier | Rate limited by tier | Rate limited by tier | Unlimited basic chat |
If you are also wondering how Claude Fable 5.1 compares to other models close to it, we have prepared a comparison table below. Compare context, strength and image support for this model.
| Model | Context | Image input | Strength | Speed |
|---|---|---|---|---|
| Claude Fable 5.1 | 1M | Yes | Hard reasoning and long tasks | Slowest |
| Claude Opus 5.5 | 1M | Yes | Coding and long documents | Slower |
| Claude Sonnet 5.5 | 1M | Yes | Coding and everyday work | Fast |
| ChatGPT 5 | 400K | Yes | Deep reasoning, tool use | Slower |
Claude Fable 5.1 is the most capable Claude model that Anthropic has released widely, and it replaces Claude Fable 5 at the same price. Claude Opus 5.5 and Claude Sonnet 5.5 cost less and answer faster. Claude Haiku 5.5 is the fastest model in the family. All four have a 1M token context window and read images. The older Claude Sonnet 4.6 and Claude Haiku 4.5 are also free on AIFreeForever.
Both models think before they answer and both read images. Claude Fable 5.1 has the larger context window of 1M tokens, compared to 400K in ChatGPT 5.
To use Claude Fable 5.1 free, simply enter your prompt into AIFreeForever's AI Chatbot present on this page with Claude Fable 5.1 selected. Open the chat box, type your question, and get your answers. Switch between text and image modes, attach a file to perform even more tasks with this model on AIFreeForever.
The Claude Fable 5.1 chat box is already open at the top of this page.
Ask Claude Fable 5.1 to solve a problem, review code, plan a project or read a file.
Drop a PDF, Word, Excel or image file. Claude Fable 5.1 reads it in one pass.
The response streams back token by token from Claude Fable 5.1.
Use Claude Fable 5.1 free on AIFreeForever, with no API key and no bill.
No email, no phone, no password. Open the page and chat with Claude Fable 5.1.
Claude Fable 5.1 thinks through a problem before it answers.
Drop a PDF, Word doc, spreadsheet or image. Claude Fable 5.1 reads it inside its 1M token window.
Run the same prompt on Claude Fable 5.1 and other models from the model bar.
Unlimited basic chat with Claude Fable 5.1 on AIFreeForever.
Claude Fable 5.1 always thinks before it answers, and how much it thinks is set by an effort level. This page sets the effort low, so answers come back sooner. You send a prompt, the model reads the whole conversation, and the answer streams back token by token.
Claude Fable 5.1's careful thinking, image input and large context window make it a good choice for hard work:
Claude Fable 5.1 works best when you give it the full problem and say what a good answer looks like. Copy any of these into the chat.
Yes. Prompts go to Claude Fable 5.1 over HTTPS through our server. We do not log your conversations and do not keep your files after the session. Nothing you type is used to train a model.
No. Like every AI model, Claude Fable 5.1 can be wrong about recent events, dates and niche facts. Always check important answers.
Yes. Claude Fable 5.1 is free on AIFreeForever with no login, no token meter and no credit card.
Claude Fable 5.1 is Anthropic's most capable widely released Claude model, made for hard reasoning and long tasks. It has a 1M token context window and reads images.
Claude Fable 5.1 replaces Claude Fable 5. On the API it costs the same, $10 per million input tokens and $50 per million output tokens.
1M tokens, and it can write answers of up to 128K tokens.
Yes. Attach a screenshot, chart or photo and ask about it.
No. Switch to Image mode on this page to use a separate image generator.
It is the same Claude Fable 5.1 model from Anthropic, without a Claude account or an API key.
Use Claude Fable 5.1 free on AIFreeForever. Unlimited basic chat, no login, no sign up.
